Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16c6d6b82f3e84d…

MALICIOUS

PDF

75.3 KB Created: 2021-02-13 20:15:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4ce1fef3dbd57039fbf1b19ef157a6ce SHA-1: ed9798dfdd9442eb2db844664ea3e2db0a191dd4 SHA-256: e16c6d6b82f3e84d6b5cf7da13d333abd1e25ffc00cd78b61061b4acc4f1494a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/wix?keyword=5th+grade+social+studies+practice+book+answers PDF link annotation
    • https://jesofoxera.weebly.com/uploads/1/3/1/4/131407857/zexon-rufanujodagodub.pdfIn PDF document text
    • https://lesinaxalurivox.weebly.com/uploads/1/3/1/3/131398335/4051a8b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453732/normal_5fcc2bbc21e2d.pdfIn PDF document text
    • https://danigutido.weebly.com/uploads/1/3/1/1/131163693/8cd42.pdfIn PDF document text
    • http://vukabuv.22web.org/21104262603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382960/normal_5fe93fcee6163.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/8Q6jaRv/voxopukimaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_5fe8659ae7820.pdfIn PDF document text
    • https://cdn.sqhk.co/wavivatus/gfY1bns/mifamakajavedalem.pdfIn PDF document text
    • http://ditumen.22web.org/49263068281.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/tojebokokot-lanesuzik-rezebosav-mikezo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/29582791543.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/8219971260.pdfIn PDF document text
    • http://befadiw.rf.gd/ujt_relaxation_oscillator_viva_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/bbc_news_report_a_story.pdfIn PDF document text
    • http://sagajifigekar.rf.gd/44910600924.pdfIn PDF document text
    • http://vapedefomagejev.epizy.com/67793634026.pdfIn PDF document text
    • http://jifunujori.rf.gd/7331911395.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/koretuxowinewenemob.pdfIn PDF document text
    • http://bifosegejigeg.rf.gd/skype_portable_offline_installer.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 5660 bytes
SHA-256: 6ee1a4bc2851be42756deb9149c31a3573b3950809106b0c35c12ef8aa0d19a6
font_01_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 10492 bytes
SHA-256: 468b88667e57eb68116bd6b47185d226eaf0cf84689cb128dbc26f0395a5464f

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